Copying speed between 2 computers

[danristei]

I have the following setup:
- Router Asus RT-N18U
- Computer 1, gigabit network card, cable connected to the router
- Computer 2, wireless network card, 300Mbps connection to the router

When I copy from C1 to C2 I have a speed of about 24MB/s
On the other hand when I copy from C2 to C1 the speed is limited to only 11 Mb/s

Any idea where this problem is coming from?

Thank you

 

[XavierMace]

Using wireless.

 

[JackMDS]

24MB/sec. (B=Byte) is what Good 300mb/sec. (b=bit) provides.

Th 11MB/sec has to do with the the Wireless.

Make sure that the Wireless card works in Full performance. Setting are in the Power options of the computer and Wireless card Drivers' properties.

.

 

[Ketchup]

Wireless depends SO much on distance and interference (walls). I know that whenever I need to copy something large from/to the laptop, I grab a network cable and do a wired copy.

 

[JeffMD]

first 2 post are neglecting the fact that the same 2 computers are giving different speeds when sending to each other over the "same" link. Wireless or not, it should remain somewhat the same. Now then, if one of them is a laptop, or using an older desktop HD, write speeds may be the limiting factor.

 

[JackMDS]

speeds when sending to each other over the "same" link. Wireless or not, it should remain somewhat the same.

Transmit and receive power is Not symmetrical in a Wireless card during sustained Load of transfer.

 

[JeffMD]

That is interesting, any documentation explaining why? Couldn't find anything when searching for wifi upload/download differences.

 

[JackMDS]

. Now then, if one of them is a laptop, or using an older desktop HD, write speeds may be the limiting factor.

According to the OP the rate of transfer is 24MB/sec. onto the Wireless computer.

That means that its HD is capable to write at this rate.

In almost all cases read of HD is equal or larger than Write.

Thus reading the Info of the HD to transfer/upload it to the wired computer should not be a problem.

Good Wireless is more of a product of Signal to Noise Ration (SNR) than signal strength.

Wired computers usually do not "soil" the LAN's traffic in its way to the Router. Good Wireless Router with Good Antenna usually provides Good signal (the whole box with its psu is designed to do so).

Wireless cards in computers (and especially Laptop) are much more volatile as signal producer.

When receiving they only transmit acknowledging data. So Wireless computer might be OK when receiving a clean download signal.

When transmitting the story is different and the quality of the Transmitting might result in lower Bandwidth.

Power adjustments in the Wireless circuits, poor Antenna and its position usually results in weaker noisy signal that might limit sustained Upload.

As for Google (as an example). I hope that is Not the main source of deciding what to do about Vaccination and Autism.

 

[JeffMD]

I see, the antenna power on each end for the transmitting are going to be pretty different levels.

As for data speeds, I have an older laptop with a 40gb drive, 24/11 sounds like what I would have gotten out of it on a GOOD day.

 

[dave_the_nerd]

Frankly, 11MB/sec is darn good for wifi.

 

[JeffMD]

I had all my computers up so I did some quality testing on my wifi too. Mainly I had a wired server and 2 laptops. My main laptop is 802.11n with a 300mbit connection on 5ghz. My older laptop uses an upgraded intel NIC that does 801.11 draft N, and is also connected at 300mbit on the 5ghz band. Doing a file transfer to the server, I found my new laptop did 20ish Mbyte effortlessly while the older laptop was dropping to 16Mbyte and less. I also noted that the older laptop was dropping it's link speed to 250mbit during the large file transfer. The older laptop was actually closer to the router, although both laptops were in the same room with it.

A transfer between the 2 (main -> old) only netted around 10 Mbyte.

 

[Engineer]

Frankly, 11MB/sec is darn good for wifi.

For 2.4GHz Wireless N...sure...if it's AC, especially 5GHz, not even close to being good!

 

[danristei]

If anyone is interested I finally found the cause of my problem.
It's not about the capability of the HD to write or read at this rate as both computers are able to read and write at much higher speeds when using a wired connection.
It is not about the walls or distance to the router as I ran the test 2 meters away from the router.
11MB/ sec is darn good wifi? I said there that I can reach 24MB when receiving(2.4Ghz, N). So that's 2 times darn good
The card was already set for full performance.
As someone else suggested on another forum I searched for the technical specifications for my wifi adapter and found that it was TX/RX - 1x2.
In other words 1 stream for transmit and 2 streams for receive.
Thank you all for your involvement.

 

[JackMDS]

When transmitting the story is different and the quality of the Transmitting might result in lower Bandwidth.

Power adjustments in the Wireless circuits, poor Antenna and its position usually results in weaker noisy signal that might limit sustained Upload.

TX/RX - 1x2 is part of what ys described above

Wireless cards (as well as other Computer components} have internal Power adjustments in addition the OS ones. It is part of the manufacturer design and the user can not do any thing about it.

There is only 6 manufacturers of Wireless cards' chipsets. Never the less, there are many performance differences because of differences of the design around the chipset.

 

[John Connor]

Don't forget WIFI adds overhead.